Fixed: Bookmarks for current books are not showing.

[MohitMaliFtechiz]

• The bookmarks toggle is not showing whether the current page is bookmarked or not when we open the ZIM file in the custom app, go into settings, and come back to the reader. Now, we are properly setting up the job when all pages are restored, ensuring it works properly in every scenario when the pages are restored in the reader.
• Added the testBookmarkToggleForCurrentPages UI test case to ensure this scenario is properly validated and to prevent similar issues in the future.
• Enhanced the LibkiwixBookmarkTest to test all scenarios for bookmarks.

Issue	After Fix
BookmarkIssue.mp4	BookmarkFix.mp4

[MohitMaliFtechiz]

Will release DWDS(kiwix/kiwix-android-custom#257), and Wikimed app after this.

[codecov]

Codecov Report

❌ Patch coverage is 72.72727% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.39%. Comparing base (0762c2a) to head (2224d7e).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...kiwixmobile/core/main/reader/CoreReaderFragment.kt	72.72%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4507      +/-   ##
============================================
- Coverage     58.63%   58.39%   -0.24%     
+ Complexity     1501     1497       -4     
============================================
  Files           320      320              
  Lines         17237    17246       +9     
  Branches       2143     2144       +1     
============================================
- Hits          10107    10071      -36     
- Misses         5726     5773      +47     
+ Partials       1404     1402       -2     

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[MohitMaliFtechiz]

@kelson42 This PR is ready for review/merge.

[kelson42]

Please implement a full e2e test for basic bookmark operations.

[MohitMaliFtechiz]

@kelson42 Refactored the test cases according to your request.